Use Alejandra to format Nix modules.

.github/workflows/test.yml

@@ -147,3 +147,13 @@ jobs:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: prettier check
         run: nix develop -c prettier --check .
+
+  alejandra:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4 # Check out repo so we can lint it
+      - uses: cachix/install-nix-action@v24
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - name: alejandra check
+        run: nix develop -c alejandra --check .

README.md

@@ -492,6 +492,8 @@ on vastly improving this experience over time.
 
 ### Linting
 
+#### Prettier
+
 Ghostty's docs and resources (not including Zig code) are linted using
 [Prettier](https://prettier.io) with out-of-the-box settings. A Prettier CI
 check will fail builds with improper formatting. Therefore, if you are
@@ -502,7 +504,32 @@ run this from the repo root before you commit:
 prettier --write .
 ```
 
-Make sure your Prettier version matches the version of in [devShell.nix](https://github.com/mitchellh/ghostty/blob/main/nix/devShell.nix).
+Make sure your Prettier version matches the version of Prettier in [devShell.nix](https://github.com/mitchellh/ghostty/blob/main/nix/devShell.nix).
+
+Nix users can use the following command to format with Prettier:
+
+```
+nix develop -c prettier --write .
+```
+
+#### Alejandra
+
+Nix modules are formatted with [Alejandra](https://github.com/kamadorueda/alejandra/). An Alejandra CI check
+will fail builds with improper formatting.
+
+Nix users can use the following command to format with Alejanda:
+
+```
+nix develop -c alejandra .
+```
+
+Non-Nix users should install Alejandra and use the follwing command to format with Alejanda:
+
+```
+alejandra .
+```
+
+Make sure your Alejandra version matches the version of Alejandra in [devShell.nix](https://github.com/mitchellh/ghostty/blob/main/nix/devShell.nix).
 
 ### Nix Package
 

flake.nix

@@ -31,13 +31,14 @@
   };
 
   outputs = {
-    nixpkgs-unstable
-  , nixpkgs-stable
-  , nixpkgs-zig-0-12
-  , zig
-  , zls
-  , ...
-  }: builtins.foldl' nixpkgs-stable.lib.recursiveUpdate {} (builtins.map (system: let
+    nixpkgs-unstable,
+    nixpkgs-stable,
+    nixpkgs-zig-0-12,
+    zig,
+    zls,
+    ...
+  }:
+    builtins.foldl' nixpkgs-stable.lib.recursiveUpdate {} (builtins.map (system: let
       pkgs-stable = nixpkgs-stable.legacyPackages.${system};
       pkgs-unstable = nixpkgs-unstable.legacyPackages.${system};
       pkgs-zig-0-12 = nixpkgs-zig-0-12.legacyPackages.${system};

nix/devShell.nix

@@ -1,55 +1,55 @@
 {
-  mkShell
-, lib
-, stdenv
-
-, bashInteractive
-, gdb
-#, glxinfo # unused
-, ncurses
-, nodejs
-, nodePackages
-, oniguruma
-, parallel
-, pkg-config
-, python3
-, scdoc
-, tracy
-, valgrind
-#, vulkan-loader # unused
-, vttest
-, wabt
-, wasmtime
-, wraptest
-, zig
-, zip
-, zls
-, llvmPackages_latest
-
-, bzip2
-, expat
-, fontconfig
-, freetype
-, glib
-, gtk4
-, libadwaita
-, harfbuzz
-, libpng
-, libGL
-, libX11
-, libXcursor
-, libXext
-, libXi
-, libXinerama
-, libXrandr
-, pixman
-, zlib
-}:
-let
+  mkShell,
+  lib,
+  stdenv,
+  bashInteractive,
+  gdb,
+  #, glxinfo # unused
+  ncurses,
+  nodejs,
+  nodePackages,
+  oniguruma,
+  parallel,
+  pkg-config,
+  python3,
+  scdoc,
+  tracy,
+  valgrind,
+  #, vulkan-loader # unused
+  vttest,
+  wabt,
+  wasmtime,
+  wraptest,
+  zig,
+  zip,
+  zls,
+  llvmPackages_latest,
+  bzip2,
+  expat,
+  fontconfig,
+  freetype,
+  glib,
+  gtk4,
+  libadwaita,
+  harfbuzz,
+  libpng,
+  libGL,
+  libX11,
+  libXcursor,
+  libXext,
+  libXi,
+  libXinerama,
+  libXrandr,
+  pixman,
+  zlib,
+  alejandra,
+}: let
   # See package.nix. Keep in sync.
-  rpathLibs = [
+  rpathLibs =
+    [
       libGL
-  ] ++ lib.optionals stdenv.isLinux [
+    ]
+    ++ lib.optionals stdenv.isLinux [
       bzip2
       expat
       fontconfig
@@ -69,10 +69,12 @@ let
       gtk4
       glib
     ];
-in mkShell {
+in
+  mkShell {
     name = "ghostty";
 
-  nativeBuildInputs = [
+    nativeBuildInputs =
+      [
         # For builds
         llvmPackages_latest.llvm
         ncurses
@@ -87,6 +89,7 @@ in mkShell {
 
         # Linting
         nodePackages.prettier
+        alejandra
 
         # Testing
         parallel
@@ -97,7 +100,8 @@ in mkShell {
         # wasm
         wabt
         wasmtime
-  ] ++ lib.optionals stdenv.isLinux [
+      ]
+      ++ lib.optionals stdenv.isLinux [
         # My nix shell environment installs the non-interactive version
         # by default so we have to include this.
         bashInteractive
@@ -107,9 +111,11 @@ in mkShell {
         wraptest
       ];
 
-  buildInputs = [
+    buildInputs =
+      [
         # TODO: non-linux
-  ] ++ lib.optionals stdenv.isLinux [
+      ]
+      ++ lib.optionals stdenv.isLinux [
         bzip2
         expat
         fontconfig
@@ -136,4 +142,4 @@ in mkShell {
     # This should be set onto the rpath of the ghostty binary if you want
     # it to be "portable" across the system.
     LD_LIBRARY_PATH = lib.makeLibraryPath rpathLibs;
-}
+  }

nix/package.nix

@@ -1,30 +1,26 @@
 {
-  lib
-, stdenv
-
-, bzip2
-, expat
-, fontconfig
-, freetype
-, harfbuzz
-, libpng
-, pixman
-, zlib
-
-, libGL
-, libX11
-, libXcursor
-, libXi
-, libXrandr
-
-, glib
-, gtk4
-, libadwaita
-
-, git
-, ncurses
-, pkg-config
-, zig_0_12
+  lib,
+  stdenv,
+  bzip2,
+  expat,
+  fontconfig,
+  freetype,
+  harfbuzz,
+  libpng,
+  pixman,
+  zlib,
+  libGL,
+  libX11,
+  libXcursor,
+  libXi,
+  libXrandr,
+  glib,
+  gtk4,
+  libadwaita,
+  git,
+  ncurses,
+  pkg-config,
+  zig_0_12,
 }: let
   # The Zig hook has no way to select the release type without actual
   # overriding of the default flags.
@@ -51,10 +47,11 @@
   # derivation in your store already. If so, just update the value as above.)
   zigCacheHash = import ./zigCacheHash.nix;
 
-  zigCache = src: stdenv.mkDerivation {
+  zigCache = src:
+    stdenv.mkDerivation {
       inherit src;
       name = "ghostty-cache";
-    nativeBuildInputs = [ git zig_0_12.hook ];
+      nativeBuildInputs = [git zig_0_12.hook];
 
       dontConfigure = true;
       dontUseZigBuild = true;
@@ -80,7 +77,8 @@
       outputHashMode = "recursive";
       outputHash = zigCacheHash;
     };
-in stdenv.mkDerivation (finalAttrs: {
+in
+  stdenv.mkDerivation (finalAttrs: {
     pname = "ghostty";
     version = "0.1.0";
 
@@ -93,9 +91,11 @@ in stdenv.mkDerivation (finalAttrs: {
       zig012Hook
     ];
 
-  buildInputs = [
+    buildInputs =
+      [
         libGL
-  ] ++ lib.optionals stdenv.isLinux [
+      ]
+      ++ lib.optionals stdenv.isLinux [
         bzip2
         expat
         fontconfig
@@ -125,7 +125,7 @@ in stdenv.mkDerivation (finalAttrs: {
       chmod u+rwX -R $ZIG_GLOBAL_CACHE_DIR
     '';
 
-  outputs = [ "out" "terminfo" "shell_integration" ];
+    outputs = ["out" "terminfo" "shell_integration"];
 
     postInstall = ''
       terminfo_src=${
@@ -144,6 +144,6 @@ in stdenv.mkDerivation (finalAttrs: {
     meta = with lib; {
       homepage = "https://github.com/mitchellh/ghostty";
       license = licenses.mit;
-    platforms = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+      platforms = ["x86_64-linux" "aarch64-linux" "aarch64-darwin"];
     };
-})
+  })

nix/wraptest.nix

@@ -1,9 +1,8 @@
 {
-  stdenv
-, fetchFromGitHub
-, autoPatchelfHook
+  stdenv,
+  fetchFromGitHub,
+  autoPatchelfHook,
 }:
-
 stdenv.mkDerivation rec {
   version = "0.1.0-e7a96089";
   pname = "wraptest";
@@ -39,6 +38,6 @@ stdenv.mkDerivation rec {
   meta = {
     description = "Test of DEC VT terminal line-wrapping semantics";
     homepage = "https://github.com/mattiase/wraptest";
-    platforms = [ "aarch64-linux" "i686-linux" "x86_64-linux" ];
+    platforms = ["aarch64-linux" "i686-linux" "x86_64-linux"];
   };
 }

shell.nix

@@ -1,9 +1,12 @@
 (import
   (
-     let flake-compat = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat; in
+    let
+      flake-compat = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat;
+    in
       fetchTarball {
         url = "https://github.com/edolstra/flake-compat/archive/${flake-compat.locked.rev}.tar.gz";
         sha256 = flake-compat.locked.narHash;
       }
   )
-   { src = ./.; }).shellNix
+  {src = ./.;})
+.shellNix